Authors DOI: https://doi.org/10.1590/S0034-89101975000300017 Downloads PDF (Portuguese) Published 1975-09-01 Issue Vol. 9 No. 3 (1975) Section Thesis Abstracts How to Cite (1975). Revista De Saúde Pública, 9(3), 439-440. https://doi.org/10.1590/S0034-89101975000300017 More Citation Formats ACM ACS APA ABNT Chicago Harvard IEEE MLA Turabian Vancouver AMA Download Citation Endnote/Zotero/Mendeley (RIS) BibTeX